泰伯效应与光束准直性测量

TALBOT Effect andits Application in Measuring Optical Beam Collimation

本文从球面波传播的一般理论出发推论了分别在发散、会聚球面波及其平面波照明下的TALBOT效应的原理。运用付里叶频谱分析方法论述了在扩展光源照明下产生的TALBOT效应。讨论了利用TALBOT效应产生的莫尔条纹的特点。最后,概述了利用TALBOT效应测量光束准直性的几种方法及提高测量精度的某些途径。

Basd on the theory of spherical waves, the principle of TALBOTeffect illuminated by spherical or plane wave is deduced. Some features of theMoire fringes produced by TALBOT effect is discussed. The contrast of Moire fr-inges constructed by two gratings is independent with distance applied, with TALBOTdistances very clear fringes can be obtained everywhere just as produced by twocontact gratings. In addition, the fringes with variable space and orientation arecapable to be obtained. In this paper, a system which produces TALBOT effect andMorie fringes illuminated by extended source is discussed. The filtering ability ofthe narrow slit is analysed by using Fourier Transform. Some interesting phenomenaare also pointed out, which probably can provide for further use of the TALBOTeffect.